This file is indexed.

/usr/share/gnome-control-center/keybindings/01-input-sources.xml is in gnome-control-center-data 1:3.28.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<KeyListEntries group="system" schema="org.gnome.desktop.wm.keybindings" name="Typing">
  <KeyListEntry name="switch-input-source" reverse-entry="switch-input-source-backward" description="Switch to next input source"/>
  <KeyListEntry name="switch-input-source-backward" reverse-entry="switch-input-source" is-reversed="true" description="Switch to previous input source"/>
</KeyListEntries>